Origin of superconductivity suppression in (Dy{sub 1{minus}x}Pr{sub x})Ba{sub 2}Cu{sub 3}O{sub 7} studied by soft-x-ray absorption spectroscopy
- Synchrotron Radiation Research Center (SRRC), Hsinchu (Taiwan)
- Department of Chemistry, National Taiwan University, Taipei (Taiwan)
- Center for Condensed Matter Sciences, National Taiwan University, Taipei (Taiwan)
- Department of Physics and National Institute for Aviation Research, Wichita State University, Wichita, Kansas 67208 (United States)
O K-edge and Cu L{sub 23}-edge x-ray-absorption near-edge structure (XANES) spectra for the series of (Dy{sub 1{minus}x}Pr{sub x})Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} compounds (x=0{endash}0.7) were measured to investigate how the variation of hole states related to the superconductivity. Near the O 1s edge, prepeaks at {approximately}527.6 and {approximately}528.4 eV are assigned to transitions into O 2p holes located in the CuO{sub 3} ribbons and CuO{sub 2} planes, respectively. Both the O 2p hole concentration in the CuO{sub 2} planes and CuO{sub 3} ribbons decrease monotonically with increasing Pr doping, giving evidence in support of the hole depletion model proposed by Liechtenstein and Mazin. It clearly demonstrates that the suppression of superconductivity with Pr-doping results predominantly from the hole depletion effect. In the Cu 2p absorption edge, the high-energy shoulders originating from Cu3d{sup 9}L defected states show a linear decrease in spectral weight as the Pr doping increases, where L denotes the ligand O 2p hole on the CuO{sub 3} ribbons and the CuO{sub 2} planes. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 509052
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 21; Other Information: PBD: Jun 1997
- Country of Publication:
- United States
- Language:
- English
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